The reasons were largely political: House Democrats, at the time, had a more conservative-leaning caucus, boasting more than 50 Blue Dogs in battleground districts the party was fighting to preserve.

After a 10-year ban on assault weapons signed by former President Clinton was widely viewed as a “third rail” that helped secure George W. Bush’s White House victory in 2000, Democrats didn’t want to repeat history.

Since then, the country has seen a long string of prominent mass shootings, including violence targeting a congresswoman in Tucson, Ariz., elementary school students in Newtown, Conn., nightclubbers in Orlando, churchgoers in Charleston, S.C., country music fans in Las Vegas, high schoolers in Parkland, Fla. and Jews praying at a synagogue in Pittsburgh last month.

The most recent tragedy occurred Wednesday night at a bar in Thousand Oaks, Calif., where authorities say a Marine combat veteran killed 12 people before fatally shooting himself.

One of the victims, 27-year-old Telemachus Orfanos, survived last year’s Las Vegas massacre but was killed in the Thousand Oaks shooting.

“I don’t want prayers. I don’t want thoughts. I want gun control, and I hope to God nobody else sends me anymore prayers,” Orfanos’s mother, Susan Orfanos, said in an emotional interview with KABC that has been viewed millions of times on social media. “I want gun control. No more guns.”

The rash of devastating episodes shifted public sentiment in strong favor of gun reform, and polls show overwhelming support for measures like expanded background checks among voters of all political stripes.

Among the host of Democrats elected to the House on Tuesday in conservative districts, many embraced new restrictions on gun purchases without facing the previously feared backlash at the polls.

“The public has evolved on their belief about this, given the magnitude and disparity of gun violence and mass shootings,” Quigley said Friday by phone.

Quigley is all for pushing bold reforms, including a ban on assault weapons, but is promoting the idea of securing early victories on more popular measures.

“Let’s start where we have some commonality,” he said. “The vast majority of Americans, the majority of gun owners, the majority of NRA [National Rifle Association] members support universal background checks.

“That’s a good place to start.”

That the House will pass some kind of background-checks legislation is clear. But any new gun restrictions face tall odds in the GOP-controlled Senate, where Republicans are near-unanimous in their opposition to such reforms.

Kirk lost his reelection bid in 2016 and McCain died this year, leaving just two Senate Republicans who back strengthening background checks. Manchin just won reelection this week and Toomey isn’t up for reelection until 2022.

“Senator Toomey is continuing to work with his colleagues in the Senate to find a path forward to 60 votes for his background check legislation,” said Toomey spokesman Sam Fischer.

Complicating the math for gun reform supporters, Tuesday’s midterms added to the GOP Senate majority, and the incoming Republicans are all gun-rights promoters supported heavily by the firearms lobby.

Gun-reform advocates, long accustomed to congressional inaction on the issue, say they’ve been encouraged by what they’ve heard from Pelosi and other Democratic leaders so far.

“While so many other factors have not been settled, we believe that House Democrats will move universal background checks in early 2019,” said Robin Lloyd, government affairs director for the Courage to Fight Gun Violence, the gun-reform group led by former Rep. Gabrielle Giffords (D-Ariz.), the congresswoman shot in the head in Tucson in 2011.